From 28abd336da17ed497777169c21f3a001b8603245 Mon Sep 17 00:00:00 2001
From: Xiang Xiao <xiaoxiang@xiaomi.com>
Date: Fri, 9 Nov 2018 09:13:55 -0600
Subject: [PATCH] arch/sim/src/up_hostfs.c:  Support S_IFSOCK, DT_LNK, O_DIRECT
 and O_SYNC

---
 arch/sim/src/up_hostfs.c  | 24 +++++++++++++++++++++---
 include/nuttx/fs/hostfs.h |  5 ++++-
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/arch/sim/src/up_hostfs.c b/arch/sim/src/up_hostfs.c
index df3a03da03..b906738084 100644
--- a/arch/sim/src/up_hostfs.c
+++ b/arch/sim/src/up_hostfs.c
@@ -37,7 +37,7 @@
  * Included Files
  ****************************************************************************/
 
-#define _BSD_SOURCE
+#define _GNU_SOURCE 1
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -88,10 +88,14 @@ static void host_stat_convert(struct stat *hostbuf, struct nuttx_stat_s *buf)
     {
       buf->st_mode |= NUTTX_S_IFLNK;
     }
-  else /* if (hostbuf->st_mode & S_IFIFO) */
+  else if (hostbuf->st_mode & S_IFIFO)
     {
       buf->st_mode |= NUTTX_S_IFIFO;
     }
+  else if (hostbuf->st_mode & S_IFSOCK)
+    {
+      buf->st_mode |= NUTTX_S_IFSOCK;
+    }
 
   buf->st_size    = hostbuf->st_size;
   buf->st_blksize = hostbuf->st_blksize;
@@ -153,6 +157,16 @@ int host_open(const char *pathname, int flags, int mode)
       mapflags |= O_NONBLOCK;
     }
 
+  if (flags & NUTTX_O_SYNC)
+    {
+      mapflags |= O_SYNC;
+    }
+
+  if (flags & NUTTX_O_DIRECT)
+    {
+      mapflags |= O_DIRECT;
+    }
+
   return open(pathname, mapflags, mode);
 }
 
@@ -219,7 +233,7 @@ void host_sync(int fd)
 {
   /* Just call the sync routine */
 
-  sync();
+  fsync(fd);
 }
 
 /****************************************************************************
@@ -306,6 +320,10 @@ int host_readdir(void* dirp, struct nuttx_dirent_s* entry)
         {
           entry->d_type = NUTTX_DTYPE_DIRECTORY;
         }
+      else if (ent->d_type == DT_LNK)
+        {
+          entry->d_type = NUTTX_DTYPE_LINK;
+        }
 
       return 0;
     }
diff --git a/include/nuttx/fs/hostfs.h b/include/nuttx/fs/hostfs.h
index a94d3e5daa..67bbd3a132 100644
--- a/include/nuttx/fs/hostfs.h
+++ b/include/nuttx/fs/hostfs.h
@@ -62,14 +62,16 @@
 #define NUTTX_DTYPE_CHR         0x02
 #define NUTTX_DTYPE_BLK         0x04
 #define NUTTX_DTYPE_DIRECTORY   0x08
+#define NUTTX_DTYPE_LINK        0x10
 
 /* These must exactly match the definitions from include/sys/stat.h: */
 
-#define NUTTX_S_IFIFO           0
+#define NUTTX_S_IFIFO           (0 << 11)
 #define NUTTX_S_IFCHR           (1 << 11)
 #define NUTTX_S_IFDIR           (2 << 11)
 #define NUTTX_S_IFBLK           (3 << 11)
 #define NUTTX_S_IFREG           (4 << 11)
+#define NUTTX_S_IFSOCK          (8 << 11)
 #define NUTTX_S_IFLNK           (1 << 15)
 
 /* These must exactly match the definitions from include/fcntl.h: */
@@ -83,6 +85,7 @@
 #define NUTTX_O_NONBLOCK (1 << 6)  /* Don't wait for data */
 #define NUTTX_O_SYNC     (1 << 7)  /* Synchronize output on write */
 #define NUTTX_O_BINARY   (1 << 8)  /* Open the file in binary mode. */
+#define NUTTX_O_DIRECT   (1 << 9)  /* Avoid caching, write directly to hardware */
 
 #define NUTTX_O_RDWR     (NUTTX_O_RDONLY | NUTTX_O_WRONLY)